This could be the same problem I am experiencing. My users are editing some excel files with office 2010. The files lock and lose permissions. The only way to "fix" this is to move out the file and move it back in, so it resets the file permissions with administrator. This has probably something to do with the oplocks. I am also experiencing the issue with samba 4.0.6 as a dc on fedora 18 x64.
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